Abstract

High quality green and blue light emitting diodes(LEDs) from multiple quantum wells with stable ultrasmall indium-rich clusters of and from two different nominal indium contents have been grown by metalorganic chemical vapor deposition. Comprehensive calculations including polarization,piezoelectric field, and size effect help derive an indium composition of 59% and 31% for the In-rich clusters of and , which agrees amazingly well with the asymmetric phase diagram for phase separation. From this model, we can further demonstrate that the dominant emitting mechanism for green LED is the polarization field, however, for blue LED, both the size effect and polarization effect are equally important.

Received 15 October 2004Accepted 08 February 2005Published online 17 March 2005

Acknowledgments:

This work was financially supported by Genesis Photonics Inc company, Tainan, Taiwan and also by National Science Council of Taiwan (Grant No. NSC-92-2216-E-006-030). The authors would like to thank the Center for Micro/Nano Technology Research, National Cheng Kung University, Tainan, Taiwan, for equipment access and technical support.